19 Apr
2021
19 Apr
'21
9:13 p.m.
Hello Sergiu,
Thanks for your suggestions. Regarding option b) to put SAVP and AVP, it is not possible
with rtpengine at the moment (see https://github.com/sipwise/rtpengine/issues/435
<https://github.com/sipwise/rtpengine/issues/435>). Also using OSRTP does not work
with Zoiper. The only idea to make it compatible which I have is to add an SRTP/RTP option
to the server-side subscriber configuration. Depending on this setting I can put either
RTP/SAVP or RTP/AVP in the INVITE. The drawback ist that it only works when server and
client configuration is matching.
Thanks and regards
Markus
Am 19.04.2021 um 14:35 schrieb Sergiu Pojoga
<pojogas(a)gmail.com>om>:
Hi Marcus,
Can't say for Zoiper, but I've worked this case with Counterpath (sadly for
Canada - it is no more, has been acquired by Alianza).
Anyhow, the final conclusion at the time was: The client is correct to expect that this
is the same INVITE request that took different paths to the target (as indicated by the
different branch IDs) - and thus correct to reject it with a 482 because the requests are
not identical in content. https://tools.ietf.org/html/rfc3261#section-8.2.2.2
<https://tools.ietf.org/html/rfc3261#section-8.2.2.2> states what should occur if
there is no To tag
The suggested solutions were:
a) increment CSeq - impossible to do with a proxy
b) send both SAVP and AVP lines in the SDP of the original INVITE. If media encryption is
set to mandatory and SIP TLS is enabled then the SAVP offer would be accepted. If media
encryption is off in Bria, then the AVP offer would be accepted
Good luck.
On Mon, Apr 19, 2021 at 3:55 AM Markus Bönke <mb(a)tenios.de
<mailto:mb@tenios.de>> wrote:
Hello NG,
I saw the following threads discussing how to switch to RTP when a client does not
support SRTP.
https://lists.kamailio.org/pipermail/sr-users/2018-May/101341.html
<https://lists.kamailio.org/pipermail/sr-users/2018-May/101341.html>
https://lists.kamailio.org/pipermail/sr-users/2016-September/094457.html
<https://lists.kamailio.org/pipermail/sr-users/2016-September/094457.html>
There are some issues with Zoiper and Bria which also persist in the latest versions. Has
anyone got it work with Zoiper and Bria?
Thanks and regards
Markus
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